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參數(shù)資料
| 型號(hào)： | TPA3000D1 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 17-W MONO FILTER-FREE CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 17單聲道無濾波器D類音頻功率放大器 |
| 文件頁數(shù)： | 14/19頁 |
| 文件大小： | 273K |
| 代理商： | TPA3000D1 |
TPA3000D1
SLOS379A
–
SEPTEMBER 2001
–
REVISED JANUARY 2002
14
www.ti.com
APPLICATION INFORMATION
when to use an output filter (continued)
0.22
μ
F
0.22
μ
F
1
μ
F
15
μ
H
15
μ
H
OUTP
OUTN
Figure 25. Typical LC Output Filter, Cutoff Frequency of 41 kHz
1 nF
Ferrite
Chip Bead
OUTP
OUTN
Ferrite
Chip Bead
1 nF
Figure 26. Typical Ferrite Chip Bead Filter (Chip bead example: Fair-Rite 2512067007Y3)
gain setting via GAIN0 and GAIN1 inputs
The gain of the TPA3000D1 is set by two input terminals, GAIN0 and GAIN1.
The gains listed in Table 1 are realized by changing the taps on the input resistors inside the amplifier. This
causes the input impedance (Z
i
) to be dependent on the gain setting. The actual gain settings are controlled
by ratios of resistors, so the actual gain distribution from part-to-part is quite good. However, the input
impedance may shift by 30% due to shifts in the actual resistance of the input resistors.
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 23 k
, which is the absolute minimum input impedance of the TPA3000D1. At the lower gain
settings, the input impedance could increase as high as 313 k
.
Table 1. Gain Settings
GAIN0
GAIN1
AMPLIFIER GAIN
(dB)
INPUT IMPEDANCE
(k
)
TYP
TYP
0
0
12
241
0
1
18
168
1
0
23.5
104
1
1
36
33
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